It seems like the test cases in section 2B are not right.
Select every other element of a vector
Return the largest number that is adjacent to a zero
letter yes yes & letter no no
Back to basics 26 - Keywords
Let's Make A Deal: The Player's Dilemma 2
007: Chinese Barrack Invasion
Toads and Frogs Puzzle 2
Expand 10^n to Powers of 4
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